Contrec 515 BR03, Operation Manual

Page: 26 / 110

Installation & Maintenance
16 515 BR03 - 15 August 2021
Control Relays (Alarms)
The standard instrument has two relays, which are used for the dual stage
batch control. The relays can drive external devices such as valves, pump
circuits or external relays.
The advanced option has two extra relays that can be freely assigned as
alarm relays. The operation of alarm relay(s) can be set to various modes as
described in
Alarms on page 57. On the newer option card the separate
common terminal for relays 1 and 2 and another common terminal for relays
3 and 4 allow for different signal or supply types to be connected to the
control or alarm devices, as shown in Figure 9.
There is also an equipment failure alarm option. This alarm can have
normally closed (open) contacts which open (close) when the instrument
displays any error message as listed in
Error Messages on page 66, or if
there is a loss of power to the instrument.
The output characteristics of the relays are:
Note: Solid state relays (SSR) use AC voltage only.
Figure 9 Relay Connection Diagram
Maximum Voltage 30 volts DC or 250 volts AC
Maximum Current 3 A for EMR, 1.5A for SSR
Supply
Control
Relay 1
Relay 2
Relay 3
Relay 4
Control
Alarm/Load
Alarm/Load
R2
R1
R3
R4
RC
Relay 1-2 Common
MOV
MOV
MOV
MOV
500
Supply
1-2
3-4
RC
Relay 3-4 Common